Who bombed Boston? Security ratchets up in U.S., around world

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Boston explosion
  • Boston Marathon Explosion
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  • Boston Marathon Explosions
  • Boston Marathon Explosions
  • Boston Marathon-Explosions
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  • Boston explosion
Boston explosion
In this image from video provided by WBZ TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, Monday, April 15, 2013, in Boston.